Laboratory of Plasma and Catalysis
Paper
New insights into alkaline metal modified CoMn-oxide catalysts for formaldehyde oxidation at low temperatures
Release Time:2020-05-17
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First Author:
Wang, Zhihui
Correspondence Author:
Yu, LM; Shi, C (reprint author), Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China.
Co-author:
Crocker, Mark,Yu, Limei,Shi, Chuan,Chen, Bingbing
Date of Publication:
2020-04-25
Journal:
APPLIED CATALYSIS A-GENERAL
Included Journals:
SCIE
Document Type:
J
Volume:
596
ISSN:
0926-860X
Key Words:
Alkali metal doping; HCHO oxidation; CoMn oxide
Abstract:
Although CoMn oxides have shown promising catalytic properties in HCHO oxidation, their activities have a large space to improve especially at low temperatures ( < 70 degrees C). In the present study, Na or K doping into CoMn oxides was found to greatly enhance the low temperature activities, being one of the most active catalysts among non-noble metal catalysts. Na or K doping into CoMn oxides generates additional surface adsorbed oxygen and the amount of which has a linear relationship with the HCHO oxidation rate at 30 degrees C and 40 degrees C, which gives clear evidence of the crucial roles of surface adsorbed oxygen in HCHO oxidation. What is more, the positive effect of K doping was boosted when H2O was co-existed in the feed gas. The surface hydroxyl species generated from H2O dissociation directly participate in the HCHO oxidation, which provides a low activation energy pathway and increase the low temperature activity.